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Probably because it was cheap. Aesthetics wasn't on the list of design requirements...
I wonder if they sell jacks at Coconut audio.
Yeah I think at one point green was out of stock and black was more expensive, so double blue jacks it was. The other colors are listed on the BOM; most people just went ahead and got whatever was default I guess.
On that note, half the resistors and caps are funky values just to get whatever was currently cheapest that fit the correct size and rating. In some sense you've got to respect the penny pinching, particularly in the situations where there is no downside, but shaving off a few dollars is not really not a huge difference relative to the total cost.
Anyone using a different volume knob than indicated in the BOM? This plastic thing keeps falling off!
Blu-tak, this is DIY!
Or you could just find a knob that has set screws, but it might look funny if it's too large.
So, where's the link to the walkthrough on how to assemble it? There are lots of posts in this thread and very few discussing assembly or sound quality impressions.
Assembly discussion would be helpful for complete noobs like me. I bought mine prebuilt in fear I'd screw up my build, but a step-by-step video walkthrough (or similar) might encourage other newcomers to give it a try themselves. This amp is likely to attract a far less experienced and more solder-shy crowd than typical DIY amps: I think many of us would just as soon buy a professionally assembled amplifier, but there just aren't any comparable commercial alternatives [in the same price range] in this case.
Although I agree with the overall consensus that the O2 sounds like nothing and imparts no signature of its own, that's really not the whole story: We actually do still have a lot to talk about regarding subjective impressions, because it would be helpful to know which headphones do and don't jive with this kind of neutrality.
For instance, LFF has stated that the O2 is fantastic with the T50RP (particularly his mod) and good for the Fischer FA-003 and FA-002W, but that it does NOT mesh with the FA-002W High Edition (which is very picky and presumably requires the amp to compensate for something). These kind of impressions would be extremely valuable if we could compile a large number of them, and I don't think anyone has to feel silly or pretentious posting them, like we might if we tried to wax poetic about the amp's signature (or lack thereof) in and of itself.
Someone in the diyAudio thread said they were working on a step-by-step walkthrough. You could check there and see if it happens.
I'm not sure exactly how many people have have an O2 so far, but if they're like me then they're probably not the type to give much in the way of flowery prose about amps or DACs. I use mine every day, mostly with my T50RPs, and I enjoy it quite a bit.
Thanks for that frenchbat - its possible that my order is in the queue before yours, but in any case I wont receive my Epiphany Acoustics Objective2 headphone amplifier till January anyway, even if he shipped it tomorrow. When I receive my amplifier, I plan to commence the objective/subjective listening tests, and publish a breathless account of same for the benefit of others. Go me.
A walkthrough on how to assemble it? I don't know about everyone else, but it seemed so easy it doesn't necessitate one...
But I'm with maverick on my lack of large, published impressions. All I can add is that it works very, very well.
Actually I haven't ordered, but I was asking him about the lead time in case of an immediate order, which gives the same thing I guess. Personnally I'll wait for the desktop + DAC flavour. Who knows ? Maybe it'll get to replace my Streamer 2+ and my AHA120, which I love by the way.
I thought so too until someone said it took 3 hours to build one and then I thought if it takes that long I must be missing something and a walkthrough is necessary, and where is it?
Nah it just depends on how quick you are at stuffing boards and such. I can throw one together on breadboard in 3 hours, and still have time to watch a Harry Potter movie.
All you need to do is check the part designation on the BoM, look for it in the mouser bag, check the part to see if it's alive, stuff the board then solder in waves of 10-15 parts. Repeat.
No walkthrough is necessary as there is really nothing to adjust.
I took like 9 hours, but those were very slow hours, marked with lots of me rechecking parts to make sure they are right. 3 hours should really be considered a nice fast mark though. It was easier than a cmoy, in my opinion. It's more of a "can you read and match parts" + "can you solder" than anything really.
I don't understand how 3 hours is fast, it should take like 30 minutes if you're only putting parts on a board and soldering them on, still confused, oh well.